In addition to Outkast, Monkeys is the second Lollapalooza 2014 headliner playing this year's Summerfest, despite Lollapalooza's infamous 300-mile radius clause that has generally prohibited headliners from playing Summerfest.

Other notable additions include electronic rock duo Phantogram, which just headlined a sold-out Pabst Theater on Friday; garage-rock buzz band The Orwells; and newcomer Cole Swindell, whose single "Chillin' It" topped the country charts.

Summerfest also has confirmed the return of last year's popular Rhymesayers Entertainment showcase, a day of acts associated with the Minneapolis-based hip-hop label, almost certainly to be headlined by label co-founder and previously confirmed Summerfest 2014 act Atmosphere.

Rhymesayers acts playing Summerfest this year include Brother Ali and Grieves.

General admission tickets — excluding Marcus shows — are $9 for weekdays (entry before 4 p.m.), $16 for single-day tickets and $42 for three-day passes, available at summerfest.com at that price through June 1.

General-admission passes for all 11 days are also available at Pick 'n Save stores in the region through June 1 for $70.